1644022057 has 16 divisors (see below), whose sum is σ = 1684387152. Its totient is φ = 1604321280.

The previous prime is 1644022049. The next prime is 1644022169. The reversal of 1644022057 is 7502204461.

It can be written as a sum of positive squares in 8 ways, for example, as 22429696 + 1621592361 = 4736^2 + 40269^2 .

It is a cyclic number.

It is not a de Polignac number, because 1644022057 - 2³ = 1644022049 is a prime.

It is a super-3 number, since 3×1644022057³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1644022007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2564457 + ... + 2565097.

It is an arithmetic number, because the mean of its divisors is an integer number (105274197).

Almost surely, 2^1644022057 is an apocalyptic number.

It is an amenable number.

1644022057 is a deficient number, since it is larger than the sum of its proper divisors (40365095).

1644022057 is a wasteful number, since it uses less digits than its factorization.

1644022057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 1644022057 is about 40546.5418624079. The cubic root of 1644022057 is about 1180.2369669166.

The spelling of 1644022057 in words is "one billion, six hundred forty-four million, twenty-two thousand, fifty-seven".